Gage



M. LENTI.

GAGE.

APPLICATION FILED MAR.8.1918.

Patented Feb. 3, 1920.

' ATTORNEY MARIO LENTI, OF `IVIILAII', ITALY.

GAGE.

Specification of Letters Patent.

Patented Feb. s, 1929.

Application filed March S, 1918.A Serial No. 221,273.

To all whom @may conce/m Be it known that I, MARIO LENTI, a subject of the King of Italy, resident of Milan,

in the Kingdom of Italy, N. 15 Via Galvani, have invented new and useful Imrovements 1n or Relating to Gages,A of which the following is arspecification.

vThis invention relates to gages having- Ymeans for measuring thethickness or the diameter of bodies and means for measuring the depth of holes, recesses and the like or the difference in level between two surfaces. One object of this invention is to provide an improved gage of this character in which the thickness and depth "measurements can be read on a single scale. Another object is to provide means whereby the movable parts of the gage are firmlyvguided bythe fixed or stationary parts, whatever be their rela-- tive position. 'A further object is to provide means for correcting and compensating any defect in the proper lContact between the fixed and movable parts of the gage. c

Vith these and other objects in View, which will be apparent .from the following description of an embodiment of the im proved gage, my invention consists in the novel parts, constructions, arrangements and combinations herein shownV and described and more particularly pointed out in the claims.

Referring to the drawings which illustrate the preferred embodiment of my in- Vention:

Figure 1 is a front View of the gage;

Fig. 2 is a side elevation,

Fig. 3 is a rear view of the gage, and

Figs. 4 and 5 are cross-sections on lines A-B and C-D respectively, of Fig. l.

The gage illustrated in the drawings consists of a fixed part comprising a cross-head M and a graduated bar or scale B integral therewith and provided with a longitudinal slot cut through the full thickness s (Fig. 2) of the bar'and extending along its whole length or practically so; and a movable part or slide comprising a cross-head N rigidly connected to a frame a and to a rod p which is slidably fitted in the slot The cross-head N is herein shown to be secured to the frame a by meanseof screws o (Fig. l) and to the rod p by means of a screw V (Fig. 3). The slotf extends from a point near the cross-head M to the opposite end of bar B, where the portions of the bar on either side of the slot f are connected by two cross-pieces t and t which coperate with the walls of the slot in guiding the rod p. A thumb screw R threaded through the cross-head N and adapted to engage a clamping member L carried within the slide (Fig. el) permits of locking the slide N, a, p

at any required position'on the rule B..v

The cross-head N also carries a Vernier k which preferably, is adjustably secured thereto. As illustrated in Fig. 5, two screwszo, z5., are threaded throug the ver nier vc and bear against a block or projection Q on the frame a.k This block or projection g fits in the slot f in bar B, as best shown in Fig. il. By simultaneously turning the screws to, to in opposite directions the vernier la maybe displaced to the desired eX- tent with respect to the Vframe a.

When the instrument is notV in use the cross-head Nis brought into contact with the c ross-head M, the zero of the graduation on the Vernier 7c then being coincident with the zero on the scaleor barB, and the outer end ofthe rod p being flush with the slotted fend of bar B. In use the two cross-heads are moved apart and the body of which the thickness is to be measured is introduced therebetween, or if it be desired to measure a difference in level between two surfaces, the slotted end of bar B is placed on one of the surfaces and the cross-head N moved outwardly until the end of rod p engages the other surface. In either case the desired measurement. is indicated by the position of the Vernier relatively to the scale.

The adjustable connection between the Vernier lo and the slide-permits of correcting any imperfection in the proper engage-v ment of the contact surfaces m, m and fn., n on the cross-heads M and N respectively, due to wear or other causes. Whenever required, the proper Contact between m, m and a, a may be restored bv filing the adjacent surfaces of the cross-heads M and N, but this brings the Zero on the Vernier out of register with the zero on the graduated bar B. By turning the `screws to, to as described above the Vernier 7a may be adjusted so that the zero of its graduation will again register with the zero on the fixed scale.

It will be noted that the movable part of the device comprising the cross-head N, frame a and rod p, is guided in its movements along the barB 'by four parallel surfaces, z'. e. the sides and y of the bar B which are engaged by the cross-head N and the sides or walls 'w and e of the slot fwhich are engaged by the rod p. The cross-bars t, t provide an additional guiding means for the rod p. This arrangement is both simple and efiicient, and it minimizes the risk of errors dueto looseness or imperfect engagement of the parts, which is a distinct advantage over sliding gauges which are guided merely by the outer sides of the scales.

Itwill be readily understood that various Vchan es may be made in the construction and s ape of the gage described without departing-from the scope of my invention, as set forth in the appended claims. y

I claim: y y

l. A' gage for thicknessand depth measurements, comprising a graduated bar, a cross-head integral therewith, lsaid bar hav- Ving a longitudinal slot extending to one end Y urements, comprising a ed to slide insaid slot, and cross-pieces connecting the end portions of said bar 0n both sides of said slot.

3. A gage for thickness and depth measi urements comprising a graduated bar, a cross-head integral therewith, said bar having a longitudinal slot extending to one end thereof, a cross-head slidably mounted on f said bar, a Vernier carried by the slidable cross-head, means foradjusting said vernier` in position with respect to 'said vrslidable cross-head, and a rod secured to said slidable cross-head and slidably mounted in saidV slot. 4. A gage for thickness and depth measurements, comprising a longitudinally slotted fixed part including a crosshead and a scale, and a slidable part includingva crossf head, aivernier and a rod, said scale having a pair 0f guiding surfaces in engagement with said slidable cross-head and the longitudinal slot having a pair 0f guiding surfaces in engagement with said rod.

5. A gage for thickness and depth measraduated bar, a cross-head integral therewith, said barr4 havinga longitudinal slot extending t0 one end thereof, a slide comprising a cross-head, a frame and a rod, said cross-head and frame engaging theVV sides of said bar, said rod en`l gaging the walls of said slot, a projection on said cross-head extendin through said slot, and avvernier adjustabgfy secured to said projection. Y

MARIO LENTI.. 

